Work holder



Oct. 19 1926. 1,603,629

'R. L. MORGAN WORK HOLDER Original Filed Feb. 5, 1921- 4 Sheets-Sheet 1Oct. 19 1926.

R. L. MORGAN WORK HOLDER Original Filed Feb. 55. 1921 4 Sheets-Sheet 2 WJ %///W/ ///fl w ivy V76 L //////////////////////////n a fl f.

R. L. MORGAN WORK HOLDER Oct. 19 1926.

Original F iled Feb. 5. 1921 .ll/ VI/ ll/fl/ll/l/I/l/Il/I/l/ll/r/A/l/l//////////////A 7/////////////////////////////////AA lo M i lbllllllllI mum 4 7///////////////////// VAI/Ky mm 4 Sheets-Sheet 3 Oct.19 ,1926.

R. L. MORGAN WORK HOLDER 4 Sheets-Sheet 4 EN 1 mm M/ UU EH M Al N @N nQM R.- Q @N 4N mm mm 1 v m w H W HW mm I] Mk .X. 9% am MN R \\\\\\..1w/////////7 T2 mm NM Patented OctI 19,192 f UNITED" STATES RALPH L.MORGAN, OF WORCESTER, MASSACHUSETTS, ASSIGNOB, BY MESNE ASSIGN- MENTS, TGREENFIELD TAP AND DIE CORIPOl'tA'I.ION,- CH'USETTS, A CORPORATION OFMASSACHUSETTS.

OF GREENFIELID, MASSA- WORZK HOLDER.

Application filed February 3, 1921, Serial No. 442,259. Renewed March 8,1926.

The object of this invention is to provide a new and improved workholder particular- 1y adapted to hold work which is to be operated uponinternally. a j it v The work holder has been designed especially foruse as a part of or member of an internal. grinding machine, such forexample, as shown in an aplication "for patent filed by ne November 20,1920, Serial No. 425,475. a

The work'holder consists of a rotatable hollow spindle having workretaining means comprising iris plates and means for opening andclosingthe same, consisting preferably'of a rotary disc. t The work-"to beoperated upon-generally consists of hollow bushings and usually two ormore of such bushings are operated upon at a time. The bushings are heldin place by a fluid actuated pusher which is employed to force thebushings endwise against said work retaining means, and which pusheralso is employed for the purpose of ejecting the bushings after theyhave been ground.

The invention also consists of improved points of constructionhereinafter described and more particularly pointed out in the claims.

Referring to the drawings and in detail:

Fig. 1 is a side elevation. of the work holder;

Fig. 2 is a plan. view;

Fig. 3 is a sectional elevation;

Fig.4 is a cross sectional view on the line .l4 of Fig. 3-;

Fig. 5 is an end view of the ejecting pusher;

Fig. 6 is a sectional elevation on an en 49 larged scale of thecontrolling valve;

Fig. 7 is a cross sectional view thereof on the line 7- 7 of Fig. 6;

Fig. 8 is an end View of the work retaining means in open position;

Fig. 9 is a simliar view with the parts in closed position;

Fig. 10 is a cross sectional view on anenlarged scale through the line1010 of Fig.

50 Fig. 11 is a sectional elevation illustrating the grinding operation,and I Fig. 12 is a similar view showing how the work is ejected.

Referring to the drawings and in detail A designates the frame or base,fitted to slide, on which is a work table B. A hearing block C isprovided with an annular rib c fitted in a circular groove on the worktable, which block can be clamped in desired angular position on. thework table.

D designates a spindle or quill, the portion .'F of which forms adriving pulley, which may be rotated by a suitable belt F. The front orright hand end 20 of the spindle is enlarged and and is fitted in abearing 21 secured in the bearing block C, and the extend. ing quill 22of the spindle is fitted in another w bearing block 23 also carried bythe bearing block C. The bearing block C is made in sections boltedtogether so that the bearings can be held in position.

An accurately ground work holding bushing 24: is designed to receive oneor more bushings G-G which are to be ground internally. These bushings(ii-G are slipped into the work holding bushing 24 and are kept in placeaxially by the work retaining mechanism now to be described.

This mechanism. consists of a disc 25 which is mounted on three screws26 secured in thev right hand end of the spindle, the disc 25 havingpartial circumferential slots so that it can have a partial rotation onsaid screws. Pivoted on the three screws 26 are three iris plates 28each of which has a cam slot in which is received the end of a stud 29screwed or fastened in the disc 25. These parts are shown in Fig. 8with. the disc 25 turned as far as it will go in a contraclockwisedirection. When the parts are in this position the iris plates will beswung on the screws 26 as pivots so that their inner edge will beretracted axially. When the disc 25 is turned in clockwise directionfrom the position shown in Fig. 8 to the position shown in Fig. 9, theiris plates will be swung inwardly on the screws 26 so that the inneredges thereof will come in front of the work G which is to be ground asrepresented in Fig. 11. The inner edges of the iris plates are turned sothat when they are in the position shown in Fig. 9, they will come to:v

hill

S dill 3.

7 position. shown in Fig. 3 which will move the iris plates inwardly,thus forming the ret ning shoulder previouslydescribed.

ln case the disc should stick or should be dill-licult to operate, aclamp 31 carried. at the end of a screw 32 threaded in a cup se cured tothe holder U and having a hand wheel 32 can be brought down on thedriving belt to hold the spindle D from rotating so force can be appliedto turn the disc 57 25 while the spindle is held from rotation.

lhe mechanism for clamping and e ecting the work will now be described.

The same consists of a hollow piston-like pusher 38 fitted to slide inthe work holding bushing 24. A pipe or hollow rod 34 is socured to thispusher. This pipe 3 lpasses through a stuffing box 35 secured inside thespindle and a piston 36 is secured on the same which piston slides in aquill or cylindie;- 37 tightly fitted in the left hand end of the quill22. A stuffing; box 38 is formed on the end of the quill 22 and a pipe34- passes out through the same. a flexible hose 39 being attached tothe end of the pipe 84 so that llllJIlCiLtlHg fluid can be fed into thework holding bushing 24 to lubricate the work as it is ground by thegrinding wheel hi. [i baffle. plate -10 is preferably formed in thepusher to give an even flow of the liquid to the worlr. The spindle iskept in place axially in its bearings by nuts d1-41 screwed on the same.To control the operation of the pusher a cylindrical valve 453 is fittedon the quill 22. This cylindrical valve has packings at its ends held inplace by collars 4st held by screws to the ends of the valve. The valveis provided with three annular grooves 45, &6 and 4?. the two outergrooves 42-5 and 47 being connected by a passage 4-8 to which an exhaustpipe 49 is attached and the middle groove 46 is connected to a passage50 to which a pressure pipe 51 is attached. The pipes 51 and areconnected to a source of pressure and to an exhaust respectively byflexible-hose. ll. set of holes 52 is bored through the quill 22 and thecylinder 37 to connect to the ins de of said cylinder 8'2 and anotherset of holes is bored axially through the quill 22 to connect to theannular space between the cylinder 37 and the quill 22 at the right. thestuffin box 35 being bored out at the right of said holes to permit a.flow from said holes 53 to the right hand end oi the cylinder Anoperating handle 5 is provided tor the valve. ll hen the valve is movedto its right hand position as shown in Fla. fluid under pressure willpass through the holes 53 and the annular space between the quill 29 andthe cylinder 37 and will act on the right hand side of the piston 36and. will force the pis ton to the left, the fluid at the left of t. episton passing to the exhaust through the holes 52. ll hcn the valve isin its middle position as shown in Fig. 3 both sets of holes 52 and 53will be closed, and no pressure will be exerted to move the piston. i ihen valve is moved to its left hand position. thud under pressure willbe admitted to the holes 52 to the left of the piston 36 which wil movethe piston to the right and t we fluid the right a of the piston williau through the holes 53. ihus, moving the valve to its right handposition the piston will move to the left, by moving the valve to itsleft hand position the piston will move to the right, and by leaving thevalve in its intermediate position the piston will be relieved frompressure.

The term fluid is to be understood as broad enough to include bothliquids and gases or vapors oil, water and compressed air beinginstances of suitable operating fluids.

A door or water guard 55 is pivoted to the bearing block C, which dooris provided to direct the issuing grinding compound down onto the tableof the machine. This door swings out of the way when the work is to beejected. The details and operation oi this door are shown, described andclaimed in an application filed on even date hero with by Myleslll'organ. Serial No. 442.258.

ln operation the valve is moved to its right hand position and the disc25 is moved to the position shown in Fig. 8. This will open the irisplates and will cause the pusher to move to its left hand position. Thebushings to be ground are then inserted in the work holding bushing Thenthe disc is moved to the position shown in Fig. 9. inwardly closing theiris plates and placing" a work holding shoulder at the right of thebushings to be ground. Then the cylindrical valve is moved to the left.This causes the fluid and pressure to force the pusher to the right toengage the left hand end of the bushings to be ground. The bushings willthus beheld rigidly in position by the pressure of the pusher tore ingthe same a inst the closed iris plates. It will-be noted that thebushings to be ground will be held in this position entirely by endthrust whereby they will not be distorted circuinterentially tor thegrinding operation. The spindle is then set in rota tion. the work t ion the neoaeae position shown in Fig. 8'withdrawing the iris plates fromthe right of the bushings. The valve is then moved to the left and thefluid under pressure will force the bushings Gr-Gr to the right and willeject the same as shown in Fig. 12. Thus, the bushings to be ground canbe quickly placed in position, accurately held in place by end thrustduring the grinding operation, and quickly ejected after the grindingoperation. Thus the production of the machine can be increased by thisrapid handling of the work.

The details and arrangements herein shown and described may be greatlyvaried by a skilled mechanic without departing from the scope of myinvention as expressed in the claims.

Havin thus described my invention, what I claim and desire to secure byLetters Patent is 1. In a machine tool, a work holder com prising arotatable work supporting member iaving a' recess at one end thereof toreceive the work, a plurality of plates pivotally mounted at the end ofsaid supporting member, and an actuating device also mounted on saidmember and connected to said plates, said device being eliective byrelative angular movement to advance said plates toward the axis of saidwork holder to form an annular flange about the end of said recess, andmeans to force the work axially against the flange thus formed by saidplates and to hold the work in position for the operation of the machinethereon.

2. In a machine tool, a work holder comprising a rotatable worksupporting memher having a recess at one end thereof to receive thework, a plurality of plates pivoted at the end of said supportingmember, a disc mounted for limited angular move ment at the end of saidsupporting member and having a pin and cam slot connection with each ofsaid plates, said disc being effective by relative angular movementthereof to advance said plates to form an annular flange about the endof said recess,

and means to force the work axially against the flange thus formed bysaid plates and to hold the work in position for the operation of themachine thereon.

8. A work holder comprising a rotatable hollow spindle havingwork-retaining means consisting of iris plates, and means for operatingthe same, and means for temporarily holding or clamping the spindle fromrotation during the adjustment of said plates.

4. In a machine tool, a work holder comprising a rotatable worksupporting member having a recess at one end thereof to receive thework, means to retain the work in said recess and prevent axial outwardmovement tive position to prevent outward movement of the work in saidspindle, and an axially moving pusher for forcing the work axiallyagainst said work-retaining means to hold the work in operative positionfor ejecting the Work when said work-retaining means'is moved toinoperative position.

6. In a machine tool, a Work holder comprising a rotatable worksupporting member having a recess at one end thereof to receive thework, means to retain the work in said recess and prevent axialoutwardmovement thereof, and an axially movable pusher efiective toforce the work along said recess and against said work retaining meansto clamp the work in position for the operation of said machine thereon,said pusher being operated by fluid pressure and having an openingtherethrough by which lubricating fluid may be conducted to the work.

7. In a machine tool, a work holder comprising a rotatable worksupporting member having a recess at one end thereof to receive thework, means to retain the work in said recess and prevent axial outwardmovement thereof, and an axially movable pusher efiec' tive to force thework along said recess and against said work retaining means to clampthe work in position for the operation of said machine thereon, and asliding cylinhollow to permit the introduction of lubricating fluid tothe work and having an enlarged outer end with a baffle plate mountedtherein to uniformly distribute said lubricating fluid to the work.

8. Tn a machine tool, a work holder 0011b prising a rotatable worksupporting member having a recess at one end thereof to receive thework, means to retain the work in said recess and prevent axial outwardmovement thereof, an axially movable pusher effective to force the workalong said recess and against said work retaining means to clamp thework in position for the operation or said machine thereon, and asliding cylindrical valve mounted on said rotatable work supporting themember and effective to control the axial movementof said pusher byregulating the flow of fluid under pressure thereto. 7 in testimonywhereof I have hereunto afiixed my signature.

RALPH L. MQBGAN.

